package day013.package_class;

public class Demo03 {
    public static void main(String[] args) {
        Integer num = 10;//自动装箱：Integer num=Integer.valueOf(10);

        num = num + 10;//自动拆箱：num=num.intValue()+10;
        num++;//自动拆箱：num=num.intValue()+1;

        System.out.println(num);
    }
}
